MCAT Question of the Day


  • Q:

    Oxalic acid, H2C2O4, is a diprotic acid with a pKa value of 1.19. If 0.10 M oxalic acid is titrated 0.10 M NaOH, what would be the pH halfway to the first equivalence point? Relevant equilibria are given below:

    H2C2O4 + H2O ↔ H3O+ + HC2O4- (pKa1 = 1.19)
    HC2O4- + H2O ↔ H3O+ + C2O4-2 (pKa2 = 4.21)


     

    A

    1.19

    B

    4.21

    C

    2.70

    D

    2.11



    Acid/Base Equilibria | Titrations |
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